r - 增加辅助 y 轴与其标题之间的间距

Question

我绘制了一个带有两个 y 轴的图表。然而，根据我的口味，轴的标题有点太接近了。我已经设法拉开主轴标题的距离，但不知道如何对次轴进行同样的操作。这是我使用过的代码:

ggplot(data1, aes(x=year))+
geom_line(aes(y= data1$`export share`, colour= "export share"), size = 2)+
  geom_line(aes(y=data1$pm25/coeff, colour= "pm25"), size = 2)+
  scale_x_continuous(breaks = scales::pretty_breaks(n = 17), name = "Year")+
  scale_y_continuous(name="Export Share of GDP", labels = scales::percent, sec.axis=sec_axis(trans = ~.*coeff, name = "PM2.5"))+
  theme(axis.title.y = element_text(margin = margin(t = 0, r = 20, b = 0, l = 0)), axis.text.x = element_text(vjust = 5) ,legend.title = element_blank(), legend.box.margin = margin(0,0,0,10), text = element_text(size = 30)) +
  scale_colour_discrete("",
                        breaks=c("export share", "pm25"),
                        labels=c("Export Share of GDP", "PM2.5")) +
  geom_vline(xintercept=2006) +
   geom_vline(xintercept = 2000)

Answer 1

您可以通过增加plot.margin的第二个参数来增加右侧的边距

+ theme(plot.margin=unit(c(1,3,1,1), "cm"))

然后增加axis.title.y.right的vjust参数:

+ theme(axis.title.y.right = element_text(vjust=2 or 3 or 4))

vjust 的数字越大，离轴越远。当然，您可以将上述两个“主题”命令合并为一个。